Upon passing the Idaho bar exam, he worked as an attorney in private practice in Idaho's Mini-Cassia Area. In 2003 he was appointed city attorney for Rupert, Minidoka, and Acequia cities. He also served as the City Attorney and Prosecutor for the City of Burley. At the time of his first appointment, he was the youngest city attorney in Idaho. In 2012, Anthon was hired as Rupert City Administrator. Anthon also serves on the corporate board of directors of the Mart Group—a potato processing and marketing company. In 2020, Anthon began teaching part time at the University of Idaho College of Law.
When incumbent Senator Dean Cameron resigned his seat for an appointment as the director of the Department of Insurance, the Legislative District 27 Republican Central Committee sent three names in order of preference to Governor Butch Otter: Anthon, Doug Pickett of Oakley, and Wayne Hurst of Declo. Otter appointed Anthon to serve the remainder of Cameron's term. Anthon was subsequently elected in 2016 and reelected in 2018, 2020, 2022 and 2024.
After his first year in the Idaho Senate, Anthon was recognized as one of the 'Emerging Leaders' in the nation's state legislatures by The State Legislative Leaders Foundation. Idaho Senate Republicans elected Anthon in 2017 as the Majority Caucus Chairman—one of four Republican leadership positions in the Idaho State Senate. In 2020, Anthon was elected as the Idaho Senate Majority Leader. He was re-elected Majority Leader in 2022. In 2024, Anthon was elected to the Idaho Senate's top role of President Pro Tempore.
Committee assignments
State Affairs Committee
Judiciary and Rules Committee
Anthon previously served on the Education Committee in 2016; he served on the Commerce Committee and the Health and Welfare Committees in 2017; he also served on the Local Government & Taxation Committee in 2018 through 2020.
Elections
District 27 Senate - Cassia and Minidoka Counties.
